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A cell can be balanced against 110 cm an...

A cell can be balanced against `110 cm` and `100 cm` of potentiometer wire, respectively with and without being short circuited through a resistance of `10 Omega`. Its internal resistance is

A

0.5 ohm

B

2.0 ohm

C

zero

D

1.0 ohm

Text Solution

Verified by Experts

The correct Answer is:
D
Internal resistance of the cell is written as
`r= R ((E )/(V) -1) = R ((l_(1))/(l_(2)) -1) = 10 ((110)/(100) -1) = 1 Omega` Thus option (d) is the correct choice.
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